Author Topic: What to do while my motor is out?  (Read 393 times)

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Offline GHtokyo

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What to do while my motor is out?
« on: March 13, 2017, 12:57:51 PM »
HI Everyone,
I revived a '68 350 GTR last year, and like an idiot, I over-torqued the exhaust flange cracking a piece off the left cylinder.   :'( So that is getting welded at the machine shop.  Besides replacing the gaskets, checking piston and ring clearances, I'm wondering if I should inspect anything on the bottom end while I have the motor out of the frame.  What are the common issues with these motors to look for?  The motor was running well, but there was some oil leaking on the left side, spraying on my left pant leg as I rode.  It looks like it was coming from the base gasket because there's lots of built up crud around there.

Greg

Offline old smokey

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Re: What to do while my motor is out?
« Reply #1 on: March 14, 2017, 12:00:42 AM »
Hi, welcome to the Bridgestone site.
A nice starting point with that GTR there.
Did you buy that from Alex in WI?
The photo looks familiar from an ad I've seen before.
'67 350 GTR undergoing repairs with a '75 Yamaha TX500 front end

Offline Harry

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Re: What to do while my motor is out?
« Reply #2 on: March 18, 2017, 03:28:36 PM »
Nice looking GTR.  If you have the owners manual it would be good to read through it.  Even better is the shop manual.  This site has one that you can download.  Check it out. And welcome to the site.  With so many stoneheads it's got great info.  Harry

Offline grundlegrabber

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Re: What to do while my motor is out?
« Reply #3 on: March 18, 2017, 11:07:53 PM »
While the engine is out, I'd advise replacing the rubber mounts. The bottom mounts are pressed in to the frame from the top down. Engine needs to be out to remove & replace them. The rubber in the mounts deteriorates from age & oil contamination. All of the other mounts can be replaced with the engine in, but it's easier when engine is out.

Offline GHtokyo

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Re: What to do while my motor is out?
« Reply #4 on: March 30, 2017, 09:22:46 PM »
Thanks for all the well wishes.  Yes, Old Smokey, I bought it from Alex in Milwaukee a few years back.  I looked at the bottom motor mounts, and they are a bit deteriorated. Good Call, I should replace them, and I see Richard has those for sale also, but I wonder if there's a better option than original rubber?  I called energy suspension, no luck.  Will try Prothane next.
The welding done at Competition Cycle looks amazing, like the cylinder was never damaged!  I noticed some oil leaking from what I think is the neutral safety switch on the left side of the motor.  Looking into that now.
Greg

Offline BRT-GTR

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Re: What to do while my motor is out?
« Reply #5 on: March 31, 2017, 03:58:39 PM »
       Hi Greg,
                     From experience, the neutral switch cases are notorious for developing hair line cracks which lead to an oil leak. They are made from a hard, heat set, bakelite type plastic which cracks over time or from over tightening the screws. New ones are not generally available as far as I know. Degrease the case and smear the outside with epoxy resin or similar sealant. I've just done a quick fix on one using Hylomar gasket sealant. Any other suggestions for sealing these welcome.
     Clean the contact points on the switch arm and inside the case before you put it back. Don't unscrew the switch arm unless you have to. I recently unscrewed a perfectly good one to find that the split spring lock washer turned the contact backwards, shearing off its locating lug,  dammn.
              Brian.   
« Last Edit: April 01, 2017, 04:51:00 PM by BRT-GTR »
Growing old is compulsory, Growing up is optional.

Offline ziggy stardust

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Re: What to do while my motor is out?
« Reply #6 on: April 04, 2017, 04:29:01 AM »
Yes you need to encapsulate the whole switch, think I used a petrol (gas) tank epoxy type filler on mine? When fitting the three screws add some under the screw heads as well as gear box oil bleeds out through the screw holes if you don't.

Z
I am only responsible for what I say, not for how you interpret it.

 


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